html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2018  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %idsrules = ();
  36 my %idssettings=();
  37 my %rulessettings=();
  38 my %rulesetsources = ();
  39 my %cgiparams=();
  40 my %checked=();
  41 my %selected=();
  42 my %ignored=();
  43
  44 # Read-in main settings, for language, theme and colors.
  45 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  46 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  47
  48 # Get the available network zones, based on the config type of the system and store
  49 # the list of zones in an array.
  50 my @network_zones = &IDS::get_available_network_zones();
  51
  52 # File where the used rulefiles are stored.
  53 my $idsusedrulefilesfile = "$IDS::settingsdir/suricata-used-rulefiles.yaml";
  54
  55 # File where the addresses of the homenet are stored.
  56 my $idshomenetfile = "$IDS::settingsdir/suricata-homenet.yaml";
  57
  58 # File which contains the enabled sids.
  59 my $enabled_sids_file = "$IDS::settingsdir/oinkmaster-enabled-sids.conf";
  60
  61 # File which contains the disabled sids.
  62 my $disabled_sids_file = "$IDS::settingsdir/oinkmaster-disabled-sids.conf";
  63
  64 # File which contains wheater the rules should be changed.
  65 my $modify_sids_file = "$IDS::settingsdir/oinkmaster-modify-sids.conf";
  66
  67 # File which stores the configured IPS settings.
  68 my $idssettingsfile = "$IDS::settingsdir/settings";
  69
  70 # File which stores the configured rules-settings.
  71 my $rulessettingsfile = "$IDS::settingsdir/rules-settings";
  72
  73 # File which stores the configured settings for whitelisted addresses.
  74 my $ignoredfile = "$IDS::settingsdir/ignored";
  75
  76 # File which contains the rules to whitelist addresses on suricata.
  77 my $whitelistfile = "$IDS::rulespath/whitelist.rules";
  78
  79 my $errormessage;
  80
  81 # Create files if they does not exist yet.
  82 unless (-f "$enabled_sids_file") { &IDS::create_empty_file($enabled_sids_file); }
  83 unless (-f "$disabled_sids_file") { &IDS::create_empty_file($disabled_sids_file); }
  84 unless (-f "$modify_sids_file") { &IDS::create_empty_file($modify_sids_file); }
  85 unless (-f "$idsusedrulefilesfile") { &IDS::create_empty_file($idsusedrulefilesfile); }
  86 unless (-f "$idssettingsfile") { &IDS::create_empty_file($idssettingsfile); }
  87 unless (-f "$rulessettingsfile") { &IDS::create_empty_file($rulessettingsfile); }
  88 unless (-f "$ignoredfile") { &IDS::create_empty_file($ignoredfile); }
  89 unless (-f "$whitelistfile" ) { &IDS::create_empty_file($whitelistfile); }
  90
  91 # Hash which contains the colour code of a network zone.
  92 my %colourhash = (
  93         'red' => $Header::colourred,
  94         'green' => $Header::colourgreen,
  95         'blue' => $Header::colourblue,
  96         'orange' => $Header::colourorange
  97 );
  98
  99 &Header::showhttpheaders();
 100
 101 #Get GUI values
 102 &Header::getcgihash(\%cgiparams);
 103
 104 ## Add/edit an entry to the ignore file.
 105 #
 106 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
 107
 108         # Check if any input has been performed.
 109         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
 110
 111                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
 112                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
 113                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
 114                 }
 115         } else {
 116                 $errormessage = "$Lang::tr{'guardian empty input'}";
 117         }
 118
 119         # Go further if there was no error.
 120         if ($errormessage eq '') {
 121                 my %ignored = ();
 122                 my $id;
 123                 my $status;
 124
 125                 # Assign hash values.
 126                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 127                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 128
 129                 # Read-in ignoredfile.
 130                 &General::readhasharray($ignoredfile, \%ignored);
 131
 132                 # Check if we should edit an existing entry and got an ID.
 133                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 134                         # Assin the provided id.
 135                         $id = $cgiparams{'ID'};
 136
 137                         # Undef the given ID.
 138                         undef($cgiparams{'ID'});
 139
 140                         # Grab the configured status of the corresponding entry.
 141                         $status = $ignored{$id}[2];
 142                 } else {
 143                         # Each newly added entry automatically should be enabled.
 144                         $status = "enabled";
 145
 146                         # Generate the ID for the new entry.
 147                         #
 148                         # Sort the keys by their ID and store them in an array.
 149                         my @keys = sort { $a <=> $b } keys %ignored;
 150
 151                         # Reverse the key array.
 152                         my @reversed = reverse(@keys);
 153
 154                         # Obtain the last used id.
 155                         my $last_id = @reversed[0];
 156
 157                         # Increase the last id by one and use it as id for the new entry.
 158                         $id = ++$last_id;
 159                 }
 160
 161                 # Add/Modify the entry to/in the ignored hash.
 162                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 163
 164                 # Write the changed ignored hash to the ignored file.
 165                 &General::writehasharray($ignoredfile, \%ignored);
 166
 167                 # Regenerate the ignore file.
 168                 &GenerateIgnoreFile();
 169         }
 170
 171         # Check if the IDS is running.
 172         if(&IDS::ids_is_running()) {
 173                 # Call suricatactrl to perform a reload.
 174                 &IDS::call_suricatactrl("reload");
 175         }
 176
 177 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 178 #
 179
 180 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 181         my %ignored = ();
 182
 183         # Only go further, if an ID has been passed.
 184         if ($cgiparams{'ID'}) {
 185                 # Assign the given ID.
 186                 my $id = $cgiparams{'ID'};
 187
 188                 # Undef the given ID.
 189                 undef($cgiparams{'ID'});
 190
 191                 # Read-in ignoredfile.
 192                 &General::readhasharray($ignoredfile, \%ignored);
 193
 194                 # Grab the configured status of the corresponding entry.
 195                 my $status = $ignored{$id}[2];
 196
 197                 # Switch the status.
 198                 if ($status eq "disabled") {
 199                         $status = "enabled";
 200                 } else {
 201                         $status = "disabled";
 202                 }
 203
 204                 # Modify the status of the existing entry.
 205                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 206
 207                 # Write the changed ignored hash to the ignored file.
 208                 &General::writehasharray($ignoredfile, \%ignored);
 209
 210                 # Regenerate the ignore file.
 211                 &GenerateIgnoreFile();
 212
 213                 # Check if the IDS is running.
 214                 if(&IDS::ids_is_running()) {
 215                         # Call suricatactrl to perform a reload.
 216                         &IDS::call_suricatactrl("reload");
 217                 }
 218         }
 219
 220 ## Remove entry from ignore list.
 221 #
 222 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 223         my %ignored = ();
 224
 225         # Read-in ignoredfile.
 226         &General::readhasharray($ignoredfile, \%ignored);
 227
 228         # Drop entry from the hash.
 229         delete($ignored{$cgiparams{'ID'}});
 230
 231         # Undef the given ID.
 232         undef($cgiparams{'ID'});
 233
 234         # Write the changed ignored hash to the ignored file.
 235         &General::writehasharray($ignoredfile, \%ignored);
 236
 237         # Regenerate the ignore file.
 238         &GenerateIgnoreFile();
 239
 240         # Check if the IDS is running.
 241         if(&IDS::ids_is_running()) {
 242                 # Call suricatactrl to perform a reload.
 243                 &IDS::call_suricatactrl("reload");
 244         }
 245 }
 246
 247 # Check if any error has been stored.
 248 if (-e $IDS::storederrorfile) {
 249         # Open file to read in the stored error message.
 250         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 251
 252         # Read the stored error message.
 253         $errormessage = <FILE>;
 254
 255         # Close file.
 256         close (FILE);
 257
 258         # Delete the file, which is now not longer required.
 259         unlink($IDS::storederrorfile);
 260 }
 261
 262
 263 ## Grab all available snort rules and store them in the idsrules hash.
 264 #
 265 # Open snort rules directory and do a directory listing.
 266 opendir(DIR, $IDS::rulespath) or die $!;
 267         # Loop through the direcory.
 268         while (my $file = readdir(DIR)) {
 269
 270                 # We only want files.
 271                 next unless (-f "$IDS::rulespath/$file");
 272
 273                 # Ignore empty files.
 274                 next if (-z "$IDS::rulespath/$file");
 275
 276                 # Use a regular expression to find files ending in .rules
 277                 next unless ($file =~ m/\.rules$/);
 278
 279                 # Ignore files which are not read-able.
 280                 next unless (-R "$IDS::rulespath/$file");
 281
 282                 # Skip whitelist rules file.
 283                 next if( $file eq "whitelist.rules");
 284
 285                 # Call subfunction to read-in rulefile and add rules to
 286                 # the idsrules hash.
 287                 &readrulesfile("$file");
 288         }
 289
 290 closedir(DIR);
 291
 292 # Gather used rulefiles.
 293 #
 294 # Check if the file for activated rulefiles is not empty.
 295 if(-f $idsusedrulefilesfile) {
 296         # Open the file for used rulefile and read-in content.
 297         open(FILE, $idsusedrulefilesfile) or die "Could not open $idsusedrulefilesfile. $!\n";
 298
 299         # Read-in content.
 300         my @lines = <FILE>;
 301
 302         # Close file.
 303         close(FILE);
 304
 305         # Loop through the array.
 306         foreach my $line (@lines) {
 307                 # Remove newlines.
 308                 chomp($line);
 309
 310                 # Skip comments.
 311                 next if ($line =~ /\#/);
 312
 313                 # Skip blank  lines.
 314                 next if ($line =~ /^\s*$/);
 315
 316                 # Gather rule sid and message from the ruleline.
 317                 if ($line =~ /.*- (.*)/) {
 318                         my $rulefile = $1;
 319
 320                         # Check if the current rulefile exists in the %idsrules hash.
 321                         # If not, the file probably does not exist anymore or contains
 322                         # no rules.
 323                         if($idsrules{$rulefile}) {
 324                                 # Add the rulefile state to the %idsrules hash.
 325                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 326                         }
 327                 }
 328         }
 329 }
 330
 331 # Save ruleset configuration.
 332 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 333         my %oldsettings;
 334
 335         # Read-in current (old) IDS settings.
 336         &General::readhash("$rulessettingsfile", \%oldsettings);
 337
 338         # Prevent form name from been stored in conf file.
 339         delete $cgiparams{'RULESET'};
 340
 341         # Check if an oinkcode has been provided.
 342         if ($cgiparams{'OINKCODE'}) {
 343                 # Check if the oinkcode contains unallowed chars.
 344                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 345                         $errormessage = $Lang::tr{'invalid input for oink code'};
 346                 }
 347         }
 348
 349         # Go on if there are no error messages.
 350         if (!$errormessage) {
 351                 # Store settings into settings file.
 352                 &General::writehash("$rulessettingsfile", \%cgiparams);
 353         }
 354
 355         # Check if the the automatic rule update hass been touched.
 356         if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 357                 # Call suricatactrl to set the new interval.
 358                 &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 359         }
 360
 361 # Save ruleset.
 362 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 363         # Arrays to store which rulefiles have been enabled and will be used.
 364         my @enabled_rulefiles;
 365
 366         # Hash to store the user-enabled and disabled sids.
 367         my %enabled_disabled_sids;
 368
 369         # Loop through the hash of idsrules.
 370         foreach my $rulefile(keys %idsrules) {
 371                 # Check if the rulefile is enabled.
 372                 if ($cgiparams{$rulefile} eq "on") {
 373                         # Add rulefile to the array of enabled rulefiles.
 374                         push(@enabled_rulefiles, $rulefile);
 375
 376                         # Drop item from cgiparams hash.
 377                         delete $cgiparams{$rulefile};
 378                 }
 379         }
 380
 381         # Read-in the files for enabled/disabled sids.
 382         # This will be done by calling the read_enabled_disabled_sids_file function two times
 383         # and merge the returned hashes together into the enabled_disabled_sids hash.
 384         %enabled_disabled_sids = (
 385                 &read_enabled_disabled_sids_file($disabled_sids_file),
 386                 &read_enabled_disabled_sids_file($enabled_sids_file));
 387
 388         # Loop through the hash of idsrules.
 389         foreach my $rulefile (keys %idsrules) {
 390                 # Loop through the single rules of the rulefile.
 391                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 392                         # Skip the current sid if it is not numeric.
 393                         next unless ($sid =~ /\d+/ );
 394
 395                         # Check if there exists a key in the cgiparams hash for this sid.
 396                         if (exists($cgiparams{$sid})) {
 397                                 # Look if the rule is disabled.
 398                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 399                                         # Check if the state has been set to 'on'.
 400                                         if ($cgiparams{$sid} eq "on") {
 401                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 402                                                 $enabled_disabled_sids{$sid} = "enabled";
 403
 404                                                 # Drop item from cgiparams hash.
 405                                                 delete $cgiparams{$rulefile}{$sid};
 406                                         }
 407                                 }
 408                         } else {
 409                                 # Look if the rule is enabled.
 410                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 411                                         # Check if the state is 'on' and should be disabled.
 412                                         # In this case there is no entry
 413                                         # for the sid in the cgiparams hash.
 414                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 415                                         $enabled_disabled_sids{$sid} = "disabled";
 416
 417                                         # Drop item from cgiparams hash.
 418                                         delete $cgiparams{$rulefile}{$sid};
 419                                 }
 420                         }
 421                 }
 422         }
 423
 424         # Open enabled sid's file for writing.
 425         open(ENABLED_FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 426
 427         # Open disabled sid's file for writing.
 428         open(DISABLED_FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 429
 430         # Write header to the files.
 431         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 432         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 433
 434         # Check if the hash for enabled/disabled files contains any entries.
 435         if (%enabled_disabled_sids) {
 436                 # Loop through the hash.
 437                 foreach my $sid (keys %enabled_disabled_sids) {
 438                         # Check if the sid is enabled.
 439                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 440                                 # Print the sid to the enabled_sids file.
 441                                 print ENABLED_FILE "enablesid $sid\n";
 442                         # Check if the sid is disabled.
 443                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 444                                 # Print the sid to the disabled_sids file.
 445                                 print DISABLED_FILE "disablesid $sid\n";
 446                         # Something strange happende - skip the current sid.
 447                         } else {
 448                                 next;
 449                         }
 450                 }
 451         }
 452
 453         # Close file for enabled_sids after writing.
 454         close(ENABLED_FILE);
 455
 456         # Close file for disabled_sids after writing.
 457         close(DISABLED_FILE);
 458
 459         # Open file for used rulefiles.
 460         open (FILE, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
 461
 462         # Write yaml header to the file.
 463         print FILE "%YAML 1.1\n";
 464         print FILE "---\n\n";
 465
 466         # Write header to file.
 467         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 468
 469         # Allways load the whitelist.
 470         print FILE " - whitelist.rules\n";
 471
 472         # Check if the enabled_rulefiles array contains any entries.
 473         if (@enabled_rulefiles) {
 474                 # Loop through the array of rulefiles which should be loaded and write them to the file.
 475                 foreach my $file (@enabled_rulefiles) {
 476                         print FILE " - $file\n";
 477                 }
 478         }
 479
 480         # Close file after writing.
 481         close(FILE);
 482
 483         # Lock the webpage and print message.
 484         &working_notice("$Lang::tr{'snort working'}");
 485
 486         # Call oinkmaster to alter the ruleset.
 487         &IDS::oinkmaster();
 488
 489         # Check if the IDS is running.
 490         if(&IDS::ids_is_running()) {
 491                 # Call suricatactrl to perform a reload.
 492                 &IDS::call_suricatactrl("reload");
 493         }
 494
 495         # Reload page.
 496         &reload();
 497
 498 # Download new ruleset.
 499 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 500         # Check if the red device is active.
 501         unless (-e "${General::swroot}/red/active") {
 502                 $errormessage = $Lang::tr{'could not download latest updates'};
 503         }
 504
 505         # Check if enought free disk space is availabe.
 506         if(&IDS::checkdiskspace()) {
 507                 $errormessage = "$Lang::tr{'not enough disk space'}";
 508         }
 509
 510         # Check if any errors happend.
 511         unless ($errormessage) {
 512                 # Lock the webpage and print notice about downloading
 513                 # a new ruleset.
 514                 &working_notice("$Lang::tr{'snort working'}");
 515
 516                 # Call subfunction to download the ruleset.
 517                 if(&IDS::downloadruleset()) {
 518                         $errormessage = $Lang::tr{'could not download latest updates'};
 519
 520                         # Call function to store the errormessage.
 521                         &IDS::_store_error_message($errormessage);
 522
 523                         # Preform a reload of the page.
 524                         &reload();
 525                 } else {
 526                         # Call subfunction to launch oinkmaster.
 527                         &IDS::oinkmaster();
 528
 529                         # Check if the IDS is running.
 530                         if(&IDS::ids_is_running()) {
 531                                 # Call suricatactrl to perform a reload.
 532                                 &IDS::call_suricatactrl("reload");
 533                         }
 534
 535                         # Perform a reload of the page.
 536                         &reload();
 537                 }
 538         }
 539 # Save snort settings.
 540 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 541         my %oldidssettings;
 542         my $reload_page;
 543         my $monitored_zones = 0;
 544
 545         # Read-in current (old) IDS settings.
 546         &General::readhash("$idssettingsfile", \%oldidssettings);
 547
 548         # Prevent form name from been stored in conf file.
 549         delete $cgiparams{'IDS'};
 550
 551         # Check if the IDS should be enabled.
 552         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 553                 # Check if any ruleset is available. Otherwise abort and display an error.
 554                 unless(%idsrules) {
 555                         $errormessage = $Lang::tr{'ids no ruleset available'};
 556                 }
 557
 558                 # Loop through the array of available interfaces.
 559                 foreach my $zone (@network_zones) {
 560                         # Convert interface name into upper case.
 561                         my $zone_upper = uc($zone);
 562
 563                         # Check if the IDS is enabled for this interaces.
 564                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 565                                 # Increase count.
 566                                 $monitored_zones++;
 567                         }
 568                 }
 569
 570                 # Check if at least one zone should be monitored, or show an error.
 571                 unless ($monitored_zones >= 1) {
 572                         $errormessage = $Lang::tr{'ids no network zone'};
 573                 }
 574         }
 575
 576         # Go on if there are no error messages.
 577         if (!$errormessage) {
 578                 # Store settings into settings file.
 579                 &General::writehash("$idssettingsfile", \%cgiparams);
 580         }
 581
 582         # Generate file to store the home net.
 583         &generate_home_net_file();
 584
 585         # Open modify sid's file for writing.
 586         open(FILE, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
 587
 588         # Write file header.
 589         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 590
 591         # Check if the traffic only should be monitored.
 592         unless($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 593                 # Tell oinkmaster to switch all rules from alert to drop.
 594                 print FILE "modifysid \* \"alert\" \| \"drop\"\n";
 595         }
 596
 597         # Close file handle.
 598         close(FILE);
 599
 600         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 601         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 602                 # Check if a ruleset exists.
 603                 if (%idsrules) {
 604                         # Lock the webpage and print message.
 605                         &working_notice("$Lang::tr{'snort working'}");
 606
 607                         # Call oinkmaster to alter the ruleset.
 608                         &IDS::oinkmaster();
 609
 610                         # Set reload_page to "True".
 611                         $reload_page="True";
 612                 }
 613         }
 614
 615         # Check if the IDS currently is running.
 616         if(&IDS::ids_is_running()) {
 617                 # Check if ENABLE_IDS is set to on.
 618                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 619                         # Call suricatactrl to perform a reload of suricata.
 620                         &IDS::call_suricatactrl("reload");
 621                 } else {
 622                         # Call suricatactrl to stop suricata.
 623                         &IDS::call_suricatactrl("stop");
 624                 }
 625         } else {
 626                 # Call suricatactrl to start suricata.
 627                 &IDS::call_suricatactrl("start");
 628         }
 629
 630         # Check if the page should be reloaded.
 631         if ($reload_page) {
 632                 # Perform a reload of the page.
 633                 &reload();
 634         }
 635 }
 636
 637 # Read-in idssettings and rulesetsettings
 638 &General::readhash("$idssettingsfile", \%idssettings);
 639 &General::readhash("$rulessettingsfile", \%rulessettings);
 640
 641 # If no autoupdate intervall has been configured yet, set default value.
 642 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 643         # Set default to "weekly".
 644         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 645 }
 646
 647 # Read-in ignored hosts.
 648 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 649
 650 $checked{'ENABLE_IDS'}{'off'} = '';
 651 $checked{'ENABLE_IDS'}{'on'} = '';
 652 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 653 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 654 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 655 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 656 $selected{'RULES'}{'nothing'} = '';
 657 $selected{'RULES'}{'community'} = '';
 658 $selected{'RULES'}{'emerging'} = '';
 659 $selected{'RULES'}{'registered'} = '';
 660 $selected{'RULES'}{'subscripted'} = '';
 661 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 662 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 663 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 664 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 665 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 666
 667 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 668
 669 ### Java Script ###
 670 print <<END
 671 <script>
 672         // Tiny java script function to show/hide the rules
 673         // of a given category.
 674         function showhide(tblname) {
 675                 \$("#" + tblname).toggle();
 676         }
 677 </script>
 678 END
 679 ;
 680
 681 &Header::openbigbox('100%', 'left', '', $errormessage);
 682
 683 if ($errormessage) {
 684         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 685         print "<class name='base'>$errormessage\n";
 686         print "&nbsp;</class>\n";
 687         &Header::closebox();
 688 }
 689
 690 # Draw current state of the IDS
 691 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 692
 693 # Check if the IDS is running and obtain the process-id.
 694 my $pid = &IDS::ids_is_running();
 695
 696 # Display some useful information, if suricata daemon is running.
 697 if ($pid) {
 698         # Gather used memory.
 699         my $memory = &get_memory_usage($pid);
 700
 701         print <<END;
 702                 <table width='95%' cellspacing='0' class='tbl'>
 703                         <tr>
 704                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 705                         </tr>
 706
 707                         <tr>
 708                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 709                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 710                         </tr>
 711
 712                         <tr>
 713                                 <td class='base'></td>
 714                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 715                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 716                         </tr>
 717
 718                         <tr>
 719                                 <td class='base'></td>
 720                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 721                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 722                         </tr>
 723                 </table>
 724 END
 725 } else {
 726         # Otherwise display a hint that the service is not launched.
 727         print <<END;
 728                 <table width='95%' cellspacing='0' class='tbl'>
 729                         <tr>
 730                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 731                         </tr>
 732
 733                         <tr>
 734                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 735                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 736                         </tr>
 737                 </table>
 738 END
 739 }
 740 &Header::closebox();
 741
 742 my $rulesdate;
 743
 744 # Check if a ruleset allready has been downloaded.
 745 if ( -f "$IDS::rulestarball"){
 746         # Call stat on the filename to obtain detailed information.
 747         my @Info = stat("$IDS::rulestarball");
 748
 749         # Grab details about the creation time.
 750         $rulesdate = localtime($Info[9]);
 751 }
 752
 753 # Draw elements for IDS configuration.
 754 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 755
 756 print <<END
 757 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 758         <table width='100%' border='0'>
 759                 <tr>
 760                         <td class='base' colspan='2'>
 761                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 762                         </td>
 763
 764                         <td class='base' colspan='2'>
 765                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>$Lang::tr{'ids monitor traffic only'}
 766                         </td>
 767                 </tr>
 768
 769                 <tr>
 770                         <td><br><br></td>
 771                         <td><br><br></td>
 772                         <td><br><br></td>
 773                         <td><br><br></td>
 774                 </tr>
 775
 776                 <tr>
 777                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 778                 </tr>
 779
 780                 <tr>
 781 END
 782 ;
 783
 784 # Loop through the array of available networks and print config options.
 785 foreach my $zone (@network_zones) {
 786         my $checked_input;
 787         my $checked_forward;
 788
 789         # Convert current zone name to upper case.
 790         my $zone_upper = uc($zone);
 791
 792         # Grab checkbox status from settings hash.
 793         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 794                 $checked_input = "checked = 'checked'";
 795         }
 796
 797         print "<td class='base' width='25%'>\n";
 798         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 799         print "&nbsp$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone}</font>\n";
 800         print "</td>\n";
 801 }
 802
 803 print <<END
 804                 </tr>
 805         </table>
 806
 807         <br><br>
 808
 809         <table width='100%'>
 810                 <tr>
 811                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 812                 </tr>
 813         </table>
 814 </form>
 815 END
 816 ;
 817
 818 &Header::closebox();
 819
 820 # Draw elements for ruleset configuration.
 821 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 822
 823 print <<END
 824 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 825         <table width='100%' border='0'>
 826                 <tr>
 827                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 828                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 829                 </tr>
 830
 831                 <tr>
 832                         <td><select name='RULES'>
 833                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 834                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 835                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 836                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 837                         </select>
 838                         </td>
 839
 840                         <td>
 841                                 <select name='AUTOUPDATE_INTERVAL'>
 842                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >$Lang::tr{'no'}</option>
 843                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'urlfilter daily'}</option>
 844                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'urlfilter weekly'}</option>
 845                                 </select>
 846                         </td>
 847                 </tr>
 848
 849                 <tr>
 850                         <td colspan='2'>
 851                                 <br>$Lang::tr{'ids rules license'} <a href='https://www.snort.org/subscribe' target='_blank'>www.snort.org</a>$Lang::tr{'ids rules license1'}</br>
 852                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 853                         </td>
 854                 </tr>
 855
 856                 <tr>
 857                         <td colspan='2' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 858                 </tr>
 859
 860                 <tr>
 861                         <td>&nbsp;</td>
 862
 863                         <td align='right'>
 864 END
 865 ;
 866                 # Check if a ruleset source has been configured yet.
 867                 unless($rulessettings{'RULES'}) {
 868                         # If no ruleset settings have been saved yet, disable the button to download / update the ruleset.
 869                         print"<input type='submit' name='RULESET' disabled='disabled' value='$Lang::tr{'download new ruleset'}'>\n";
 870                 } else {
 871                         # Ruleset setting have been saved. - Check if a ruleset already is downloaded.
 872                         if (%idsrules) {
 873                                 # Allow to press the button and show it as "update ruleset".
 874                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 875                         } else {
 876                                 # Also allow to press the button, but show it as "download new ruleset".
 877                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>\n";
 878                         }
 879                 }
 880 print <<END;
 881                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 882                         </td>
 883
 884                 </tr>
 885         </table>
 886 </form>
 887 END
 888 ;
 889
 890 &Header::closebox();
 891
 892 #
 893 # Whitelist / Ignorelist
 894 #
 895 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 896
 897 print <<END;
 898         <table width='100%'>
 899                 <tr>
 900                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 901                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 902                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 903                 </tr>
 904 END
 905                 # Check if some hosts have been added to be ignored.
 906                 if (keys (%ignored)) {
 907                         my $col = "";
 908
 909                         # Loop through all entries of the hash.
 910                         while( (my $key) = each %ignored)  {
 911                                 # Assign data array positions to some nice variable names.
 912                                 my $address = $ignored{$key}[0];
 913                                 my $remark = $ignored{$key}[1];
 914                                 my $status  = $ignored{$key}[2];
 915
 916                                 # Check if the key (id) number is even or not.
 917                                 if ($cgiparams{'ID'} eq $key) {
 918                                         $col="bgcolor='${Header::colouryellow}'";
 919                                 } elsif ($key % 2) {
 920                                         $col="bgcolor='$color{'color22'}'";
 921                                 } else {
 922                                         $col="bgcolor='$color{'color20'}'";
 923                                 }
 924
 925                                 # Choose icon for the checkbox.
 926                                 my $gif;
 927                                 my $gdesc;
 928
 929                                 # Check if the status is enabled and select the correct image and description.
 930                                 if ($status eq 'enabled' ) {
 931                                         $gif = 'on.gif';
 932                                         $gdesc = $Lang::tr{'click to disable'};
 933                                 } else {
 934                                         $gif = 'off.gif';
 935                                         $gdesc = $Lang::tr{'click to enable'};
 936                                 }
 937
 938 print <<END;
 939                                 <tr>
 940                                         <td width='20%' class='base' $col>$address</td>
 941                                         <td width='65%' class='base' $col>$remark</td>
 942
 943                                         <td align='center' $col>
 944                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 945                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 946                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 947                                                         <input type='hidden' name='ID' value='$key' />
 948                                                 </form>
 949                                         </td>
 950
 951                                         <td align='center' $col>
 952                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 953                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 954                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 955                                                         <input type='hidden' name='ID' value='$key' />
 956                                                 </form>
 957                                         </td>
 958
 959                                         <td align='center' $col>
 960                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 961                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 962                                                         <input type='hidden' name='ID' value='$key'>
 963                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 964                                                 </form>
 965                                         </td>
 966                                 </tr>
 967 END
 968                         }
 969                 } else {
 970                         # Print notice that currently no hosts are ignored.
 971                         print "<tr>\n";
 972                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 973                         print "</tr>\n";
 974                 }
 975
 976         print "</table>\n";
 977
 978         # Section to add new elements or edit existing ones.
 979 print <<END;
 980         <br>
 981         <hr>
 982         <br>
 983
 984         <div align='center'>
 985                 <table width='100%'>
 986 END
 987
 988         # Assign correct headline and button text.
 989         my $buttontext;
 990         my $entry_address;
 991         my $entry_remark;
 992
 993         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 994         if ($cgiparams{'ID'} ne '') {
 995                 $buttontext = $Lang::tr{'update'};
 996                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
 997
 998                         # Grab address and remark for the given key.
 999                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1000                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1001                 } else {
1002                         $buttontext = $Lang::tr{'add'};
1003                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1004                 }
1005
1006 print <<END;
1007                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1008                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1009                         <tr>
1010                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1011                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1012
1013                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1014                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1015                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1016                         </tr>
1017                         </form>
1018                 </table>
1019         </div>
1020 END
1021
1022 &Header::closebox();
1023
1024 # Only show the section for configuring the ruleset if one is present.
1025 if (%idsrules) {
1026         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
1027
1028                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1029
1030                 # Output display table for rule files
1031                 print "<table width='100%'>\n";
1032
1033                 # Loop over each rule file
1034                 foreach my $rulefile (sort keys(%idsrules)) {
1035                         my $rulechecked = '';
1036
1037                         # Check if rule file is enabled
1038                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1039                                 $rulechecked = 'CHECKED';
1040                         }
1041
1042                         # Convert rulefile name into category name.
1043                         my $categoryname = &_rulefile_to_category($rulefile);
1044
1045                         # Table and rows for the rule files.
1046                         print"<tr>\n";
1047                         print"<td class='base' width='5%'>\n";
1048                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1049                         print"</td>\n";
1050                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1051                         print"<td class='base' width='5%' align='right'>\n";
1052                         print"<a href=\"javascript:showhide('$categoryname')\">SHOW</a>\n";
1053                         print"</td>\n";
1054                         print"</tr>\n";
1055
1056                         # Rows which will be hidden per default and will contain the single rules.
1057                         print"<tr  style='display:none' id='$categoryname'>\n";
1058                         print"<td colspan='3'>\n";
1059
1060                         # Local vars
1061                         my $lines;
1062                         my $rows;
1063                         my $col;
1064
1065                         # New table for the single rules.
1066                         print "<table width='100%'>\n";
1067
1068                         # Loop over rule file rules
1069                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1070                                 # Local vars
1071                                 my $ruledefchecked = '';
1072
1073                                 # Skip rulefile itself.
1074                                 next if ($sid eq "Rulefile");
1075
1076                                 # If 2 rules have been displayed, start a new row
1077                                 if (($lines % 2) == 0) {
1078                                         print "</tr><tr>\n";
1079
1080                                         # Increase rows by once.
1081                                         $rows++;
1082                                 }
1083
1084                                 # Colour lines.
1085                                 if ($rows % 2) {
1086                                         $col="bgcolor='$color{'color20'}'";
1087                                 } else {
1088                                         $col="bgcolor='$color{'color22'}'";
1089                                 }
1090
1091                                 # Set rule state
1092                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1093                                         $ruledefchecked = 'CHECKED';
1094                                 }
1095
1096                                 # Create rule checkbox and display rule description
1097                                 print "<td class='base' width='5%' align='right' $col>\n";
1098                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1099                                 print "</td>\n";
1100                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1101
1102                                 # Increment rule count
1103                                 $lines++;
1104                         }
1105
1106                         # If do not have a second rule for row, create empty cell
1107                         if (($lines % 2) != 0) {
1108                                 print "<td class='base'></td>";
1109                         }
1110
1111                         # Close display table
1112                         print "</tr></table></td></tr>";
1113                 }
1114
1115                 # Close display table
1116                 print "</table>";
1117
1118 print <<END
1119 <table width='100%'>
1120 <tr>
1121         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1122                 &nbsp; <!-- space for future online help link -->
1123         </td>
1124 </tr>
1125 </table>
1126 </form>
1127 END
1128 ;
1129         &Header::closebox();
1130 }
1131
1132 &Header::closebigbox();
1133 &Header::closepage();
1134
1135 #
1136 ## A function to display a notice, to lock the webpage and
1137 ## tell the user which action currently will be performed.
1138 #
1139 sub working_notice ($) {
1140         my ($message) = @_;
1141
1142         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1143         &Header::openbigbox('100%', 'left', '', $errormessage);
1144         &Header::openbox( 'Waiting', 1,);
1145                 print <<END;
1146                         <table>
1147                                 <tr>
1148                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1149                                         <td>$message</td>
1150                                 </tr>
1151                         </table>
1152 END
1153         &Header::closebox();
1154         &Header::closebigbox();
1155         &Header::closepage();
1156 }
1157
1158 #
1159 ## A tiny function to perform a reload of the webpage after one second.
1160 #
1161 sub reload () {
1162         print "<meta http-equiv='refresh' content='1'>\n";
1163
1164         # Stop the script.
1165         exit;
1166 }
1167
1168 #
1169 ## Private function to read-in and parse rules of a given rulefile.
1170 #
1171 ## The given file will be read, parsed and all valid rules will be stored by ID,
1172 ## message/description and it's state in the idsrules hash.
1173 #
1174 sub readrulesfile ($) {
1175         my $rulefile = shift;
1176
1177         # Open rule file and read in contents
1178         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1179
1180         # Store file content in an array.
1181         my @lines = <RULEFILE>;
1182
1183         # Close file.
1184         close(RULEFILE);
1185
1186         # Loop over rule file contents
1187         foreach my $line (@lines) {
1188                 # Remove whitespaces.
1189                 chomp $line;
1190
1191                 # Skip blank  lines.
1192                 next if ($line =~ /^\s*$/);
1193
1194                 # Local vars.
1195                 my $sid;
1196                 my $msg;
1197
1198                 # Gather rule sid and message from the ruleline.
1199                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1200                         $msg = $1;
1201                         $sid = $2;
1202
1203                         # Check if a rule has been found.
1204                         if ($sid && $msg) {
1205                                 # Add rule to the idsrules hash.
1206                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1207
1208                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1209                                 if ($line =~ /^\#/) {
1210                                         # If yes, the rule is disabled.
1211                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1212                                 } else {
1213                                         # Otherwise the rule is enabled.
1214                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1215                                 }
1216                         }
1217                 }
1218         }
1219 }
1220
1221 #
1222 ## Function to get the used memory of a given process-id.
1223 #
1224 sub get_memory_usage($) {
1225         my ($pid) = @_;
1226
1227         my $memory = 0;
1228
1229         # Try to open the status file for the given process-id on the pseudo
1230         # file system proc.
1231         if (open(FILE, "/proc/$pid/status")) {
1232                 # Loop through the entire file.
1233                 while (<FILE>) {
1234                         # Splitt current line content and store them into variables.
1235                         my ($key, $value) = split(":", $_, 2);
1236
1237                         # Check if the current key is the one which contains the memory usage.
1238                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1239                         # of the entire process.
1240                         if ($key eq "VmRSS") {
1241                                 # Found the memory usage add it to the memory variable.
1242                                 $memory += $value;
1243
1244                                 # Break the loop.
1245                                 last;
1246                         }
1247                 }
1248
1249                 # Close file handle.
1250                 close(FILE);
1251
1252                 # Return memory usage.
1253                 return $memory;
1254         }
1255
1256         # If the file could not be open, return nothing.
1257         return;
1258 }
1259
1260 #
1261 ## Function to generate the file which contains the home net information.
1262 #
1263 sub generate_home_net_file() {
1264         my %netsettings;
1265
1266         # Read-in network settings.
1267         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
1268
1269         # Get available network zones.
1270         my @network_zones = &IDS::get_available_network_zones();
1271
1272         # Temporary array to store network address and prefix of the configured
1273         # networks.
1274         my @networks;
1275
1276         # Loop through the array of available network zones.
1277         foreach my $zone (@network_zones) {
1278                 # Skip the red network - It never can be part to the home_net!
1279                 next if($zone eq "red");
1280
1281                 # Convert current zone name into upper case.
1282                 $zone = uc($zone);
1283
1284                 # Generate key to access the required data from the netsettings hash.
1285                 my $zone_netaddress = $zone . "_NETADDRESS";
1286                 my $zone_netmask = $zone . "_NETMASK";
1287
1288                 # Obtain the settings from the netsettings hash.
1289                 my $netaddress = $netsettings{$zone_netaddress};
1290                 my $netmask = $netsettings{$zone_netmask};
1291
1292                 # Convert the subnetmask into prefix notation.
1293                 my $prefix = &Network::convert_netmask2prefix($netmask);
1294
1295                 # Generate full network string.
1296                 my $network = join("/", $netaddress,$prefix);
1297
1298                 # Check if the network is valid.
1299                 if(&Network::check_subnet($network)) {
1300                         # Add the generated network to the array of networks.
1301                         push(@networks, $network);
1302                 }
1303         }
1304
1305         # Format home net declaration.
1306         my $line = "\"\[";
1307
1308         # Loop through the array of networks.
1309         foreach my $network (@networks) {
1310                 # Add the network to the line.
1311                 $line = "$line" . "$network";
1312
1313                 # Check if the current network was the last in the array.
1314                 if ($network eq $networks[-1]) {
1315                         # Close the line.
1316                         $line = "$line" . "\]\"";
1317                 } else {
1318                         # Add "," for the next network.
1319                         $line = "$line" . "\,";
1320                 }
1321         }
1322
1323         # Open file to store the addresses of the home net.
1324         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
1325
1326         # Print yaml header.
1327         print FILE "%YAML 1.1\n";
1328         print FILE "---\n\n";
1329
1330         # Print notice about autogenerated file.
1331         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
1332
1333         # Print the generated and required HOME_NET declaration to the file.
1334         print FILE "HOME_NET:\t$line\n";
1335
1336         # Close file handle.
1337         close(FILE);
1338
1339 }
1340
1341 #
1342 ## Function to generate the rules file with whitelisted addresses.
1343 #
1344 sub GenerateIgnoreFile() {
1345         my %ignored = ();
1346
1347         # SID range 1000000-1999999 Reserved for Local Use
1348         # Put your custom rules in this range to avoid conflicts
1349         my $sid = 1500000;
1350
1351         # Read-in ignoredfile.
1352         &General::readhasharray($ignoredfile, \%ignored);
1353
1354         # Open ignorefile for writing.
1355         open(FILE, ">$whitelistfile") or die "Could not write to $whitelistfile. $!\n";
1356
1357         # Config file header.
1358         print FILE "# Autogenerated file.\n";
1359         print FILE "# All user modifications will be overwritten.\n\n";
1360
1361         # Add all user defined addresses to the whitelist.
1362         #
1363         # Check if the hash contains any elements.
1364         if (keys (%ignored)) {
1365                 # Loop through the entire hash and write the host/network
1366                 # and remark to the ignore file.
1367                 while ( (my $key) = each %ignored) {
1368                         my $address = $ignored{$key}[0];
1369                         my $remark = $ignored{$key}[1];
1370                         my $status = $ignored{$key}[2];
1371
1372                         # Check if the status of the entry is "enabled".
1373                         if ($status eq "enabled") {
1374                                 # Check if the address/network is valid.
1375                                 if ((&General::validip($address)) || (&General::validipandmask($address))) {
1376                                         # Write rule line to the file to pass any traffic from this IP
1377                                         print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
1378
1379                                         # Increment sid.
1380                                         $sid++;
1381                                 }
1382                         }
1383                 }
1384         }
1385
1386         close(FILE);
1387 }
1388
1389 #
1390 ## Function to read-in the given enabled or disables sids file.
1391 #
1392 sub read_enabled_disabled_sids_file($) {
1393         my ($file) = @_;
1394
1395         # Temporary hash to store the sids and their state. It will be
1396         # returned at the end of this function.
1397         my %temphash;
1398
1399         # Open the given filename.
1400         open(FILE, "$file") or die "Could not open $file. $!\n";
1401
1402         # Loop through the file.
1403         while(<FILE>) {
1404                 # Remove newlines.
1405                 chomp $_;
1406
1407                 # Skip blank lines.
1408                 next if ($_ =~ /^\s*$/);
1409
1410                 # Skip coments.
1411                 next if ($_ =~ /^\#/);
1412
1413                 # Splitt line into sid and state part.
1414                 my ($state, $sid) = split(" ", $_);
1415
1416                 # Skip line if the sid is not numeric.
1417                 next unless ($sid =~ /\d+/ );
1418
1419                 # Check if the sid was enabled.
1420                 if ($state eq "enablesid") {
1421                         # Add the sid and its state as enabled to the temporary hash.
1422                         $temphash{$sid} = "enabled";
1423                 # Check if the sid was disabled.
1424                 } elsif ($state eq "disablesid") {
1425                         # Add the sid and its state as disabled to the temporary hash.
1426                         $temphash{$sid} = "disabled";
1427                 # Invalid state - skip the current sid and state.
1428                 } else {
1429                         next;
1430                 }
1431         }
1432
1433         # Close filehandle.
1434         close(FILE);
1435
1436         # Return the hash.
1437         return %temphash;
1438 }
1439
1440 #
1441 ## Private function to convert a given rulefile to a category name.
1442 ## ( No file extension anymore and if the name contained a dot, it
1443 ## would be replaced by a underline sign.)
1444 #
1445 sub _rulefile_to_category($) {
1446         my ($filename) = @_;
1447
1448         # Splitt the filename into single chunks and store them in a
1449         # temorary array.
1450         my @parts = split(/\./, $filename);
1451
1452         # Return / Remove last element of the temporary array.
1453         # This removes the file extension.
1454         pop @parts;
1455
1456         # Join together the single elements of the temporary array.
1457         # If these are more than one, use a "underline" for joining.
1458         my $category = join '_', @parts;
1459
1460         # Return the converted filename.
1461         return $category;
1462 }